Gate valve



Jan. 4,1927. F 1,613,509

GATE VALVE .Tn/ven, far.'

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mmf/- Patented Jan. 4l, 1927.

' `riuso sarss VPATENT i GATE VALVE.

Application filed December 17, 1924;, Serial No.

The present invention relates to gate valves; the purpose being to provide an 1m proved construction suitable for use in a pipe line and adapted to avoid accumulation of solid matter under the gate. y

ylhe accompanying drawing shows a valve constructed according to the invention and sectioned longitudinally. Y

2 is the valve casing comprising the inlet passage 3, the outlet passage 4, the gate seat 5 and the abutment 6 against whichthe gate bears when seated.

The gate 7 is of the usual downwardly tapered form to wedge between the seat 5 and the abutment 6. Itis raised and lowered by vmeans of the spindle 8.

The gate travels in a recess 9 in the body,` which recess in most gate valves continues uninterruptedly around the lower part of the easing. The lower portion of saidrecess is ronsequently below the level ofthe inlet and outlet passages, with the result thatl when liquid containing solid mat-ter is passed through the valve, some of the solid matter is liable to settle in the lower part of the recess and hinder the seating of the gate.

The present invention overcomes this difficulty by raising the seat 7 and the recess 9 relatively to the inlet and outlet passages so as to bring the lowest part 10 of the seat substantially not lower than the extremities of the inlet and outlet passages, and by providing a substantially level outlet 11 from the lowest point of the seat and the recess.

A-B indicates the axial line of the valve, being the line joining the centres A and B of the outer ends of the passages 3 and Il, which axial line is horizontal when the valve is in its intended normal position. The flanges 12 for fixing t-he valve are normal to saidaxis A-Bg or if screw threads or other fixing means are employed, they are equivalently formed to position the valve co-axially with a pipe or other part to which the valve is fixed.

Assuming the seat 5 to be of the usual cir* cular form, its centre C is displaced from the axis A-B, in the direction in which the valve opens, by a distance about equal to the width of the valve seat. The inlet passage 3 correspondingly slopes upwards from its outer end to the seat 5. The outlet passage as a whole similarly slopes down to its outer end, but the lower part of said outlet passage i 756,509, andf in sent-h Africa December a1,v 1923.

is cutaway at 11, so as to eliminate thelower f part of 4the. abutment 6 vand tov provide a channel the lower surface d-of which forms a continuation ofthe lower surfaceof the recess 9 and is substantially parallel 'with the axis A-v-B, or in other words, level.y As the result, any solid matter which drops into the recess 9 is readily scoured away along the surface 13.

The under surface 14 of the gate may be inclined as shown to facilitate the seating of the valve should solid matter be present'under it; and the abutment 6 may be cut away as indicated at 15 to reduce friction.

It will be seen that when the valve described is inserted into a pipe line, the upward slope of the inlet and outlet passages towards the seat 5 and the raising of the seat 5 so that its centre point 6 is above the ax'is A-B, bring the lowersurface 10 of the gate recess 9 into line with the lower surfaces of the adjacent pipes. Also the cutting away of the lower surface of the sloped outlet passage 4 provides a free outlet 11 from the lower part 10 of the gate recess 9.

There is accordingly no pocket into which the solid matter can settle; solid matter which tends to settle in the gate recess 9 being scoured therefrom along the level surface 13 as easily as it is scoured along the l lower surface 10 of the pipe line, of which the surface 13 in fact forms a continuation. If the passages 3, 4 were not sloped upwards and the seat5 not raised, the lower surface 10 of the gate recess 9 could be brought into line with the pipe line at the outlet end of the valve only by lowering the outlet 4 in relation to the inlet 3 to the same extent that the seatr is raised in the present case. Such constructions are known, but have the obvious disadvantage of necessitating the pipe line attached to the outlet end of the valve being disalined with and lower than the pipe line attached to the inlet end of the valve. l f

I claim: Y

l. A gate valve, having a casing including alined inlet and outlet passages and also including an annular seat, and a gate slidably mounted on said seat substantially perpendicular to said passages; the inlet and outlet passages sloping inwardly and upwardly in opposite directions from their outer ends toward said seat, and the lower tlf) lili] tot part of the outlet passage being eut away longitudinally thereof ando the easing to provide a level-bottomed channel leading from the seat to the outer end of that passage. s

2. A gate valve having a casing including inlet and outlet passages the extremities of which are centred on a .common axis, the easing providing means for xing the valve co-axially with other bodies, the casing also providing an annular seat substantially perpendicular to said axis, the centre of said seat being displaced from said axis in the direction of opening ot' the gate by a distance substantially equal to the width of the valve seat, the inlet and outlet passages sloping from their extremities towards the seat, and

the lower part of the outlet passage being eut away longitudinally thereof and of the easing.

3. A gate valve, comprising a sliding' valve member; and a casing providing a recess into which the valve member is moved to close, and also providing` inlet and outlet passages the outer ends of which are centered on a common axis, such passages sloping inwardly and upwardly in opposite directions from their said outer ends toward said recess,

lthe lowermost portion ot the internal surface oit the outlet passage being parallel with the aforesaid axis and vin unbroken continuation with the lowermost surface of the gate recess. ln testimony whereof I aiix my signature. ALEXANDER FULLARTON GILL. 

